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Grigor Dimitrov, of Bulgaria, winces during the fourth set of his match against Frances Tiafoe, of the United States, shortly before retiring with an apparent injury, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Eduardo Munoz Alvarez)

Grigor Dimitrov, of Bulgaria, winces during the fourth set of his match against Frances Tiafoe, of the United States, shortly before retiring with an apparent injury, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Eduardo Munoz Alvarez)

Frances Tiafoe, of the United States, pumps his fist after winning a game against Grigor Dimitrov, of Bulgaria, right, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Adam Hunger)

Frances Tiafoe, of the United States, pumps his fist after winning a game against Grigor Dimitrov, of Bulgaria, right, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Adam Hunger)

Taylor Fritz, of the United States, reacts in a tiebreaker against Alexander Zverev, of Germany, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Kirsty Wigglesworth)

Taylor Fritz, of the United States, reacts in a tiebreaker against Alexander Zverev, of Germany, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Kirsty Wigglesworth)

Taylor Fritz, of the United States, reacts after defeating Alexander Zverev, of Germany, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Kirsty Wigglesworth)

Taylor Fritz, of the United States, reacts after defeating Alexander Zverev, of Germany, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Kirsty Wigglesworth)

Alexander Zverev, of Germany, bounces his racket off the court in the fourth set against Taylor Fritz, of the United States, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Kirsty Wigglesworth)

Alexander Zverev, of Germany, bounces his racket off the court in the fourth set against Taylor Fritz, of the United States, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Kirsty Wigglesworth)

Taylor Fritz, of the United States, returns a shot to Alexander Zverev, of Germany, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Pamela Smith)

Taylor Fritz, of the United States, returns a shot to Alexander Zverev, of Germany, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Pamela Smith)

Taylor Fritz, of the United States, reacts after scoring a point against Alexander Zverev, of Germany, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Kirsty Wigglesworth)

Taylor Fritz, of the United States, reacts after scoring a point against Alexander Zverev, of Germany, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Kirsty Wigglesworth)

Grigor Dimitrov, of Bulgaria, reacts with an apparent injury shortly before he was forced to retire in his match against Frances Tiafoe, of the United States, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Eduardo Munoz Alvarez)

Grigor Dimitrov, of Bulgaria, reacts with an apparent injury shortly before he was forced to retire in his match against Frances Tiafoe, of the United States, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Eduardo Munoz Alvarez)

Frances Tiafoe, of the United States, celebrates after winning a point against Grigor Dimitrov, of Bulgaria, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Eduardo Munoz Alvarez)

Frances Tiafoe, of the United States, celebrates after winning a point against Grigor Dimitrov, of Bulgaria, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Eduardo Munoz Alvarez)

Morgan Riddle watches play between Taylor Fritz, of the United States, and Alexander Zverev, of Germany, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Kirsty Wigglesworth)

Morgan Riddle watches play between Taylor Fritz, of the United States, and Alexander Zverev, of Germany, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Kirsty Wigglesworth)

Grigor Dimitrov, of Bulgaria, left, gets a pat on the back from Frances Tiafoe, of the United States, after he was forced to retire due to an apparent injury during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Adam Hunger)

Grigor Dimitrov, of Bulgaria, left, gets a pat on the back from Frances Tiafoe, of the United States, after he was forced to retire due to an apparent injury during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Adam Hunger)

Taylor Fritz, of the United States, returns a shot to Alexander Zverev, of Germany, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Pamela Smith)

Taylor Fritz, of the United States, returns a shot to Alexander Zverev, of Germany, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Pamela Smith)

Taylor Fritz, of the United States, reacts after defeating Alexander Zverev, of Germany, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Kirsty Wigglesworth)

Taylor Fritz, of the United States, reacts after defeating Alexander Zverev, of Germany, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Kirsty Wigglesworth)

Taylor Fritz, of the United States, left, hugs Alexander Zverev, of Germany, after winning their quarterfinal match during U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Pamela Smith)

Taylor Fritz, of the United States, left, hugs Alexander Zverev, of Germany, after winning their quarterfinal match during U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Pamela Smith)

Alexander Zverev, of Germany, reacts in the fourth set against Taylor Fritz, of the United States, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Kirsty Wigglesworth)

Alexander Zverev, of Germany, reacts in the fourth set against Taylor Fritz, of the United States, during the quarterfinals of the U.S. Open tennis championships, Tuesday, Sept. 3, 2024, in New York. (AP Photo/Kirsty Wigglesworth)